disagree about the realism. since there is on FIA comitte or NASCAR officials to penalise a possible ofender of the rules this is a good solution. besides there's a good reason for them - to protect the crowds and the surrounding buildings and nature from the powerful weapons. also a forcefield is more belivable to me than a magic teleportation to the spot where you got of the track
as for the falling off the tracks you still got it where it 'belongs' bridges at tech de ra and arc prime
actually I really like the hardcore approach of the old 8 or 16 bit, don't remember, f-zero games. get of track - Boom!
Big explotion. next race or Game Over.
cutting the appex .. well I'm not that skilled yet to even try such a thing and as you know I do my best to stick2trax